Which of the following best illustrates the transaction fee revenue model?
Select one:
a.
Apple accepts micropayments for single music track downloads.
b.
Epinions receives a fee after steering a customer to a participating Web site where he or she makes a purchase.
c.
eBay receives a small fee from a seller if a seller is successful in selling an item.
d.
Flickr provides basic services for free, but charges a premium for advanced services.